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Loss Per Share of Common Stock (Tables)
6 Months Ended
Jun. 30, 2021
Loss Per Share of Common Stock  
Schedule of antidilutive securities excluded from the computation of diluted weighted average shares outstanding

June 30,

2021

2020

Convertible preferred stock

    

915,000

    

1,860,600

    

Restricted stock

 

37,000

 

5,250

 

Stock options

 

4,622,470

 

3,224,885

 

 

5,574,470

 

5,090,735